JW Service Manual
Contents
1. 20 5 45V va 4 C43 2 89052 P27 Hsoa vec i 1 11 0592MHz29 40 PAIS Y XTAL VDD c ho Ec 405 1042 10uF 15V 20 1042 lt 1 10 16 2 30P 3B vss I 17 1 75 50 E gt Pr 45V CON 12P WF 9 5 5 u7 RESET 5 gt AUTO OFF m PA 4 8 P14 c Al BG 12 2 4 HDI NCEE 1042 sev NRS Bkt MH 10K P10 1 DO GND 10k 5P 10K 5P 5 gt 2 RIS oN 28 0 27 BY p25 28 DD Lopat P22 P24 57 P24 AUTO OFF gt CI 24 e P23 3 P23 gt P23 1 p22 55 9 22 22 P212 P21 P21 P20 ZERO 08015210 INT C53 C52 51 50 C49 324 EE 1 100P 5V TXD ALE PROG 22 1 5 gt mxp 5 N Y 10K x 4 INTO CAL m E iy p s CAL gt lt PU ON NRI 45V ED K 9P ug 5 7 244 Y 20100 5V C33 1042 jg z6 POWER ss gt OFF 52. 34 ANALOG DEVICES KEY FEATURES Resolution of 230 000 Counts Peak to Peak Offset Drift 5 nV C Gain Drift 2 ppm C Line Frequency Rejection gt 150 dB Buffered Differential Inputs Programmable Filter Cutoffs Specified for Drift Over Time Operates with Reference Voltages of 1 V to 5 V ADDITIONAL FEATURES Two Channel Programmable Gain Front End On Chip DAC for Offset TARE Removal FASTStep Mode AC or DC Excitation Single Supply Operation APPLICATIONS Weigh Scales Pressure Measurement GENERAL DESCRIPTION The AD7730 is a complete analog front end for weigh scale and pressure measurement applications The device accepts low level signals directly from a transducer and outputs a serial digital word The input signal is applied to a proprietary pro grammable gain front end based around an analog modulator FUNCTIONAL DVpp O VBIASO AV DD REF IN REF IN O O REFERENCE Bridge Transducer ADC AD7730 AD7730L The modulator output is processed by a low pass programmable digital filter allowing adjustment of filter cutoff output rate and settling time The part features two buffered differential programmable gain analog inputs as well as a differential reference input The part operates from a single 5 V supply It accepts four unipolar analog input ranges 0 mV to 10 mV 20 mV 40 mV and 80 mV and four bipolar ranges 10 mV 20 mV 40 mV
3. STRUCTURE Parts No Description Specification Qty Remark A0905600400 CONNECTOR PLT 164 R 1 OPTION A1001000150 TRANSFORMER W50 1 A1003010301 EMI FILTER 03AB1 1 A1304000001 SLIDE SW SY 14 H04 3 PIN 1 A1307000001 VOLTAGE SELECTOR 3 PIN 230V 115V 1 A5005000001 MICA TO 92 2 A5005000010 ISOLATION BUSH TO 220A 2 C1W50031000 K B OVERLAY W50 SERIES 1 C1W50030000 PANEL OVERLAY W50 SERIES 1 E1W5000001X Po W50 10 X 1 MAINBOARD ElW5000010X W50 30 X 1 DISPLAY F0005W50000 ALUMINUM HOUSING ALUMINUM HOUSING 1 FO005W50100 STEEL BACK PANEL W50 SERIES 186 91 0 8t 1 F0007W50000 STEEL FIXING PLATE W50 SERIES DISPLAY 2 F0011W50000 S S MOUNTING PLATE W50 SERIES HOUSING 2 G0001W50100 PLASTIC DISPLAY FRAMI W50 SERIES 1 20010000205 SCREW ROUND HEAD M2 0 4P 5L 2 20010001308 SCREW TAPPED M3 8 6 Z0010000308 SCREW ROUND HEAD M3 0 5P 8L 4 Z0010000306 SCREW ROUND HEAD M3 0 5P 5L 4 Z0011000308 SCREW FLAT HEAD M3 0 5P 8L 2 20015000410 SCREW M4 0 7P 10L 8 Z0015000415 SCREW M4 0 7P 15L 2 20016000003 NUT M3 0 5P 4 HW400000005 JUNCTION BOX JB W40 5 1 4 CHANNELS HW400000007 JUNCTION BOX JB W40 7 1 6 CHANNELS HW400000009 JUNCTION BOX JB W40 9 1 8 CHANNELS w50 10 X MAINBOARD EOW50000010 P C B w50 10 X 1 0201080321 80C32 1 010 A0202024021 TGs AT24C02 1 09 40202062640 6264 1 013 A0202275121 27C512 1 012 A0203002322 MAX232CPE 1 02 A0204074002 LG 74 00 1 014 40204074060 Tes 7406 1 U5 A0204741382 IC 74HC138 1 015 402
4. mA max max mW max mW max uW max 3 AD7730 AD7730L DVpp 5 V DVpp 3 V DVpp 5 V DVpp 43 V DVpp 5 V DVpp 3 DVpp 5 DVpp 3 DVpp 5 V DVpp 3 V DVpp 5 V DVpp 3 V Isg 800 uA Except for MCLK OUTH 5 V Ising 100 pA Except for MCLK OUT 3 V Isource 200 uA Except for MCLK OU VppP 5 V Isource 100 uA Except for MCLK OUT 3 V 2 5 mV Nominal with 5 Reference REF IN 2000 Guaranteed Monotonic FS Is the Nominal Full Scale Voltage 10 mV 20 mV 40 mV or 80 mV With 0 V External MCLK Digital I Ps 0 V or DVpp All Input Ranges Except 0 mV to 10 mV and 10 mV Input Ranges of 0 mV to 10 mV and 10 mV Only DVpp of 2 7 V to 3 3 V DVpp of 4 75 V to 5 25 V Typically 10 uA External MCLK IN 0 V or DVpp AVpp DVpp 5 V Digital 0 V or DVpp All Input Ranges Except 0 mV to 10 mV and 210 mV Input Ranges of 0 mV to 10 mV and 10 mV Only Typically 50 uW External MCLK IN 0 V or DVpp 37 AD7730 AD7730L INPUT CHOPPING THE ANALOG INPUT TO THE PARTCAN BE IN CHOPPING MODE WITH AC EXCITATION DISABLED THE INPUT CHOPPING IS INTERNALTO THE DEVICE IN CHOPPING MODE WITH AC EXCITATION ENABLED THE CHOPPING IS ASSUMED TO BE PERFORMED EXTERNAL TO THE PART AND NO INTERNAL INPUT CHOPPING IS PERFORMED THE INPUT CHOPPING CAN SINC FILTER THE FIRST STAGE OF THE
5. 14 1123 5 17 448 20 21 22 2526 297 P2 5 413 T1 P3 5 P2 5 A13 8 19 20 2 OO OUOU UUU L lt lt Q UN oomo Back ayas EZ TANNA gt 55 485 axx NN AOS Ss T2 P1 0 1 VDD T2EXIP1 1 PO 0 ADO P12 PO 1 AD1 P13 P0 2 AD2 1 4 P0 3 AD3 PO 4 AD4 15 5 05 16 0 6 06 P41 7 PO 7 AD7 3 5 3 EAIVPP RXDIP3 0 2 TXD P3 1 2 E g NE PSEN INTO P3 2 SINT1 P3 3 U PENAIS mas P2 6 A14 1135 P2 5 A13 SWR P3 6 P2 4 A12 ARDIP3 7 P2 3 A11 XTAL2 P2 2 A10 XTAL1 P2 1 A9 vss P2 0 A8 Specifications subject to change without notice contact your sales representatives for the most recent information 2 19 Ver 1 1 PID 8958 05 01 SM8958 SyneMOS Technologies Inc SM8958 May 2001 Block Diagram Decoder amp Timer 2 Timer 0 Register c um WDT RES Reset to pertinent blocks Circuit Vdd to whole chip 2 Power Circuit interrupt to pertinent blocks Circuit PC Incrementer Program Counter XTAL1 Timing EA Generator to whole system ALE PSEN Instruction Register Port O Port 1 Latch Latch 32K bytes Flash Port 2 Port 3 Port 4 Memory Latch Latch Latch E Driver 8 Mux Driver amp Mux amp 8 8 8 8 4 Specifications subject to change without notice contact your sales representatives for the most recent information 3 19 Ver 1 1 PID 8958 05 01
6. 9 23 _ 8 a P E 8 N n rr 2838 N gen At gre 5 o 5 ON oo eS 5 8 a 8 UM C32 LT 06 JP5 014016 6 0 0 T c3 3 35 35 S o 3 Zd ted 969 bed 452 440 No se 6 2 AS o 1138 91 07 12 JW 10 3 D3 N 87106 4 L 2 5 ug C33 NR3 2549 1 C 2 50 Ces 52 c r3 t mile m 3 i 1 At 9105 1 0 OLN 7 sn a 99 AS 1X3 dh 119 gt ers 0 E 1 iD 11 029 n Qo 9 VAS tar Zar Do JW 10 3 TOP OVERLAY 25 91 10 14 Eng 9 Ewe 330 TINY Tw 209 HO 3004 1 2 awe awe r3 JW 30 3 BOTTOM OVERLAY 5 BILL OF MATERIAL
7. ESIS OR FIL CARBON CARBON ESIS OR FIL ESIS CARBON OR FIL ESIS CARBON OR FIL 2 My M ESIS CONNEC CONNEC CONNEC SURGE CRYSTAL CRYSTAL BUZZER Ni Cd BATTI FUS OR OR OR 21 pd FUSE HO LD ABSORBOR ERY w50 30 X DISPLAY BOARD E0W50000100 A0101430601 A0204742372 A0204743672 A0208061180 A0501004148 A0730104050 A0805041103 A1306000003 ERSJCVE TUBE Tie DIODE CAPACIT CARBON FIL OR MLC OR R P C B MOUNT E RESIS TACT SW TOR 1 2W 6V8 1 2W 35V 10uF 16V SS 1000uF 25V 220uF 50V 2200uF 35V 4700uF 16V 10uF 16V 1042 20pF 100pF 101 7 50 1 4W 10KQ 1 4W 4 7KQ 1 4W 1000 1 4W 1KQ 1 4W 10KQ 1 4W 1 4W 2200 1 4W 20KQ 1 4W 2 2KQ 1 4W 5600 1 4W TYPI 9 PIN WAFER PITC Gl D SUB 9PIN E EMAL D SUB 25PIN FEMAL 14 471 32 768KHZ 11 0952MHZ OBO 15210 UM 3 1 2V 3 250V 500mA CO 203P W50 30 X VFD43 0601 74HC237 74HC367 UDN 6118A 1N4148 1042 10KQ 1 4W KPT 1104B 1 2 n NRRRAN as PN mM WN or H a 203 2 4 6 9 4 5 CL EZ c21 c10 16 20 22 29 35 38 17 18 1 8 R9 R6 R5 P R1 8 21 7 R11 16 18 23 15 R12 R2 4 R43 R8
8. R3 10 PW_SW1 C 1 1 C_SER1 PRN1 TNR1 X2 X1 21 F1 F1 DISP1 018 20 021 017 19 2 6 C30 34 R19 22 29 6 APPENDIX PARTS EXPLOSION 30 E PARTS NO DESCRIPTION SPECIFICATION OTY 0005 50000 ALUMINUM HOUSING ALUMINUM HOUSING 1 F0007W50000 STEEL FIXING PLATE W50 SERIES DISPLAY 2 20010000308 SCREW ROUND HEAD M3 0 5P 8L 4 20015000410 SCREW M4 0 7P 10L 8 60001150100 PLASTIC DISPLAY FRAME W50 SERIES 1 C1W50030000 PANEL OVERLAY W50 SERIES d C1W50031000 K B OVERLAY W50 SERIES 1 E0W50000100 LCD W50 30 X 1 20010001308 SCREW TAPPED M3 8 6 Z0010000306 SCREW ROUND HEAD M3 0 5P 5L 4 E0W50000010 W50 10 X 1 F0005W50100 STEEL BACK PANEL W50 SERIES 186 91 0 8t 1 SCREW 1 8 40 UNC 6 20016000003 NUT 2 4 10905600400 PLT 164 R 1 A1304000001 SLIDE SW SY 14 H04 3 PIN 1 20010000205 SCREW ROUND HEAD 2 0 4P 5L 2 A1307000001 VOLTAGE SELECTOR 3 PIN 230V 115V 1 A1003010301 EMI FILTER 03AB1 1 20011000308 SCREW FLAT HEAD 3 0 5P 8L 2 F0011W50000 S S MOUNTING PLATE W50 SERIES HOUSING 2 20015000415 SCREW 4 0 7P 15L 2 SyncMOS Technologies Inc May 2001 Product List SM8958L25 25 MHz 32KB internal memor
9. a standard calibrate weight to prompt user placing the mass onto the platter Load the mass Scale will have a beep sound when it is calibrated WEIGHT panel now displays CAL 2 There are two options now either press OFF to exit the calibration or press MODE to enter second point calibration MODE is pressed scale will display yES and ask to load the second weight which is normally close to the maximum capacity 12 12 Load the mass 13 Scale will automatically exit the calibration procedure when it is calibrated 14 Scale now reads the weight of the load on the platter Note Auto calibration can only be performed when the span value is within 10 tolerance of dealer calibration 13 3 TROUBLE SHOOTING 3 1 TROUBLE SHOOTING LOOP POWER ON DISPLAY RANDOM NO DISPLAY CHECK POWER SUPPLY CPU LCD KEYBOARD FIGURE COUNTDOWN THE CHECK CPU LCD DISPLAY DRIVER IC ERROR CODE REFER THE ERROR CODE LIST TO CHECK RELEVANT PARTS GHOST UNSTABLI Gl EADOUT HECK STRUCTURE OF LATFORM LOAD L A D UNIT AD SOLDERING CHECK POWER SUPPLY DISPLAY DRIVER IC R9 R10 IN JW 30 X C PL CE B CAN T REACH THE FULL CAPACITY CHECK STRUCTURE OF PLATFORM LO
10. and 80 mV The peak to peak resolution achievable directly from the part is 1 in 230 000 counts An on chip 6 bit DAC allows the removal of TARE voltages Clock signals for synchro nizing ac excitation of the bridge are also provided The serial interface on the part can be configured for three wire operation and is compatible with microcontrollers and digital signal processors The AD7730 contains self calibration and system calibration options and features an offset drift of less than 5 nV C and a gain drift of less than 2 ppm C The AD7730 is available in a 24 pin plastic DIP a 24 lead SOIC and 24 lead TSSOP package The AD7730L is available in a 24 lead SOIC and 24 lead TSSOP package NOTE The description of the functions and operation given in this data sheet apply to both the AD7730 and AD7730L Specifications and performance parameters differ for the parts Specifications for the AD7730L are outlined in Appendix A BLOCK DIAGRAM AD7730 SIGMA DELTA A D CONVERTER STANDBY AIN1 O soma Beuren m AGND O AIN2 D1 2 00 Es SIGMA PROGRAMMABLE DELTA DIGITAL MODULATOR FILTER SYNC MCLK IN lt MCLK OUT CLOCK SERIAL INTERFACE GENERATION AND CONTROL LOGIC REGISTER BANK CALIBRATION MICROCONTROLLER Need CLOCK FASTStep is a trademark of Analog De
11. bumps in tray MIS PCF8576U 10 chip on film frame carrier FFC men ul PCF8576U 12 chip with bumps on film frame carrier FFC EUM 2001 Oct 02 3 39 40
12. or br192 3 Press WT to confirm setup 2 5 8 Motion Filter Speed Setting F 6 Motion filter is used to give a more stable display when the working environment is affected by motion or airflow interf renc R fer to 10 the below table for motion filter speed setting Symbol Motion Filter Speed Filt O0 Disable Normal Filt 1 Minimum Filt 2 Medium Filt 3 High Filt 4 Maximum 2 5 9 AUTO AND DEALER CALIBRATION PROCEDURES 2 5 9 1 Calibration load and span value range CAL 1 CAL 2 ModelNo OFFSET LOAD SPAN RANGE LOAD SPAN RANGE Thousand APPLIED Thousand APPLIED Thousand JW 250 40 200 100g 200 300 250g 500 750 Jw 500 40 200 200g 200 300 500g 500 750 JW 1000 40 200 500g 200 300 1000g 500 750 JW 2500 40 200 10009 200 300 25009 500750 JW 300 40 200 100g 200 300 300g 600 900 JW 600 40 200 200g 200 300 600g 600 900 JW 1500 40 200 500g 200 300 1500g 600 900 JW 3000 40 200 1000g 200 300 3000g 600 900 To increase the span value Decrease the impedance value of R5 To decrease the span value Increase the impedance value of R5 Dealer Calibration Procedures La 1 will appear on Scale now displays WE Q W nter th next step
13. units may be disabled Contact your dealer for more information 2 3 4 Main Components Used Microprocessors SM8958A Crystal Oscillator 11 0592MHz Display Device WIDE ANGLE LCD DISPLAY Load Cell Capacity JW 250 300 BCL 300g JW 500 600 BCL 600g JW 1000 1500 BCL 1200g JW 2500 3000 BCL 3000g 2 3 5 Analog Specification Power supply of 5 V DC Excitation power supply for the load cell is 5 V DC Input impedance of the load cell is 350 Rated output of load cell is 1mV V The analog data processing unit is built in a closed metal box 24 bits A D converter A D Conversion Speed 20 times second Internal Resolution 1 000 000 counts 2 4 OPTIONAL INTERFACE 2 4 1 Serial RS 232C Port D SUB 9 pin RS232 PIN ASSIGNMENT PIN NUMBER ASSIGNMENT RTS 5 1 y J Remarks e RTS amp CTS are short circuited internally Should computer signal input end consists of DSR amp CD signal check cable then short circuit pin 1 6 7 amp 8 LSB MSB Stop bit 1 Data bits Start bit 0 Type EIA RS 232C Method Half duplex asynchronous transmission Format Baud rate 4800 9600 or 19200 Data bit 258 Parity bit None Stop bit SR Code AS
14. vs Time Gain Error Gain Drift vs Temperature 9 Gain Drift vs Time Bipolar Negative Full Scale Error Negative Full Scale Drift vs Temp Power Supply Rejection Common Mode Rejection CMR on AIN CMR on REF IN Analog Input DC Bias Current Analog Input DC Bias Current Drift Analog Input DC Offset Current Analog Input DC Offset Current Drift ANALOG INPUTS REFERENCE INPUTS Normal Mode 50 Hz Rejection Normal Mode 60 Hz Rejection Common Mode 50 Hz Rejection Common Mode 60 Hz Rejection Analog Inputs Differential Input Voltage Ranges 9 Absolute Common Mode Voltage Reference Input REF IN REF IN Voltage REF IN REF IN Voltage Absolute Common Mode Voltage NO REF Trigger Voltage App 5 V DVpp 3 V or 5 V REF IN AVpp REF IN AGND 0 V 4 9152 MHz All specifications to Tmax unless otherwise noted see Tables I amp 11 ote 3 See Note 3 2 10 See 2 10 See Note 3 2 120 ote 3 See Tables III amp IV 18 See Note 3 See Note 3 0 6 3 See Note 3 2 10 See Note 3 10 or 10 to 20 or 20 to 40 or 40 to 80 or 80 12 V AVpp 0 95 V 2 5 5 AGND 30 mV AVpp 30 mV 0 3 0 65 Bits min ppm of FSR max nV C typ nV 1000 Hours typ ppm of FS C max ppm of FS 1000 Hours typ ppm C max ppm 1000 Hours typ ppm of FS C max dB typ dB min nA max typ nA max pA C typ
15. 04742452 Io 74HC245 1 016 A0204745732 T 74 573 1 U11 A0206003930 TGs LM3 93 1 07 40207078050 VOLTAGE REGULATOR 7805 1 RG2 A0207078180 VOLTAGE REGULATOR I 7818 1 RG1 A0250013020 051302 1 U8 0300000028 SOCKET 28 PIN 1 012 40401009450 TRANSISTOR 25 945 2 01 02 40403008170 PHOTO COUPLER K817P 1 U6 A0501004148 DIODE 1N4148 4 D1 4 5 7 A0502000001 BRIDGE RECTIFIER 06 3 1 3 0503020030 ZENER DIODE 1 2W 3V 2 ZD1 2 28 A0503020068 A0503020350 0701106017 0701108025 0701227050 0701228035 0701478016 0702106016 0730104050 0740020050 0740101050 0804040075 0804041002 0804044701 0805041101 0805041102 0805041103 0805041104 0805041221 0805041203 0805041222 A0805041561 A0902010090 A0904121090 A0904121250 A1004140471 A1100032768 A1100311059 A1500000004 A1602036003 A5002000521 A5003000004 N N ENER DIOD ENER DIOD Pl E CAPACI OR E CAPACI OR CAPACI OR CAPACI OR HEE CAPACI CAPACIT CAPACIT CAPACIT CAPACIT OR OR OR OR OR E Zon c aa METAL F ILM RESIS METAL F ILM RESIS METAL ILM RESIS CARBON OR OR OR A ESIS CARBON OR ESIS CARBON OR E ESIS CARBON OR FIL
16. 10uF 16V 1034 100V MEF ANI 1047 d 16 17 SEN gh gt REF c23 c28 22P 0 47 100V L8 19 SEN 4 sn th gt REF 24 C25 26 27 220 220 1uF 63V 470P 7 JP2 e 1 4 teen 5 P17 US A INTO 2950 5V GND 3 i Title vo c21 GND 22 1047 1042 peg p 100uF 18V Drawing No J 10 Revision Size Sheet 2 of 5 Date 91 07 11 Drawn by 22 2 3 4 5 7 8 9 02 INVERTER Ra s 546 SAMPLE _ 1515 10K CON 12P WF P24 3 gt 9 3 RN 1 sus MODE Er GND 454 tour 1042 lt R5 een m 59 PCS WT ses 22k 1o0uF 16v 0 gt sr e OFF Mr E22 lt 5 e 21 ou 2 BKLT 1 5V R1 R2 LCDI 10K 10K 100P 100P oi PCFB578C spa 539 39 SCI 538 RU HS 558 Y En LCD G294 50 32 AE O o Seese 8 HE R9 5 00 251 96 Be2 525 te SEG100 251 gt Y E 82 519 R10 55 BE 10K 7 1 T Rio 5 6 00 251 51 512 Title Drawing No Revision JW 30 2 Size A3 Sheet 1 of 1 Date 91 04 29 Drawn by 2 3 4 5 7 8
17. AD CELL OFFSET INCORRECT RE CALIBRATE HE SCALE EADOUT 1 VALUE 14 NORMAL OPERATION 3 2 PARTS AND COMPONENTS TROUBLE SHOOTING 3 2 1 Power Supply Checking 3 2 1 1 Relevant parts Main Board JW 10 X DC JACK 01 C1061 02 C945 03 C945 04 1515 06 A733 011 1722 5 0 R18 1 28 1 2W 721 ZENER 8 2 BATTERY 6V 94 Fun un 5 A1515 AWR AICT722 50CZL 1000uF 16V 7 Y 2 c47 GND cem 16V 10u 1047 2 waz cers R20 2 cas gt r 4 7T 100uF 45 1047 CON 2P PW 1 lt 1 AUTO OFF lt gt 7 D B y Je con Sra R22 CON 2P PW 0 16 2 7K 1K 3 R23 zm TO BATTERY _ D W04 93 Clore Xx A c 03 GREEN BED R24 ZERO gt gt 1047 T 22K R25 R27 N150K 22K 06 RIS on gt A733 gt LOBAT R26 R28 M500K 27K Description 1 Power source Rechargeable Battery 6V 3Ah or AC adaptor 9V 500mA 2 How Battery is charged completel
18. Bits min ppm of FSR max uV C typ uV 1000 Hours typ uV C typ uV 1000 Hours typ ppm C typ ppm 1000 Hours typ uV C typ dB typ dB typ dB typ nA max pA C typ nA max typ dB min dB min dB min dB min mV nom mV nom mV nom mV nom min max nom nom min max min max ae Offset Error and Offset Drift Refer to Both Unipolar Offset and Bipolar Zero Errors Measured with Zero Differential Voltage At DC Measured with Zero Differential Voltage SKIP 010 Offset Error and Offset Drift Refer to Both Unipolar Offset and Bipolar Zero Errors Measured with Zero Differential Voltage At DC Measured with Zero Differential Voltage At DC Measured with Zero Differential Voltage From 49 Hz to 51 Hz From 59 Hz to 61 Hz From 49 Hz to 51 Hz From 59 Hz to 61 Hz Assuming 2 5 V or 5 V Reference with HIREF Bit Set Appropriately Gain 250 Gain 125 Gain 62 5 Gain 31 25 HIREF of Mode Register HIREF Bit of Mode Register NO REF Active If Below This Voltage NO REF Bit Inactive If Above This Voltage REV A 36 Parameter LOGIC INPUTS Input Current All Inputs Except SCLK and MCLK IN Vint Input Low Voltage Vint Input Low Voltage Input High Voltage SCLK Only Schmitt Triggered Input Vr Vr Vr MCLK IN Only Vint Input Low Voltage Vint Input Low Voltage Input High Voltage Input High Voltag
19. CAL 1 Hold and press ON RE ZERO to t EIGHT panel GHT panel will display yEs then alibrate the zero point urn on the scale Press MODE twice to enter calibration press MODE again to confirm CAL 0 to automatically hen it completes in calibrating zero point it will automatically 11 WEIGHT panel will now keep flashing a standard calibrate weight to prompt user placing the mass onto the platter Load the mass Scale will have a beep sound when it is calibrated WEIGHT panel now displays CAL _2 There are two options now either press OFF to exit the calibration 12 or press MODE to enter second point calibration when MODE is pressed scale will display yES and ask to load the second weight which is normally close to the maximum capacity Load the mass Scale will automatically exit the calibration procedure when it is calibrated Scale now reads the weight of the load on the platter Auto Calibration Procedures d 2 3 4 Hold MODE and press ON RE ZERO to turn on the scale CAL _1 will appear on WEIGHT panel Press MODE again to enter calibration WEIGHT panel will display yES then CAL 0 to automatically calibrate the zero point When it completes in calibrating zero point it will automatically nter the next step WEIGHT panel will now keep flashing
20. CII Transmission mode CONTINUOUS TRANSMISSION Data format WEIGHT include sign SPACE UNIT CR LF 1 2 3 4 6 7 8 9 10 11 12 13 14 2 5 INTERNAL SETTINGS AND CALIBRATION PROCEDURES 7 internal settings are available as below table Function Symbol Description 0 Compulsory zero display 1 EG Offset value Reading 2 F 2 Full display Segment 3 ES Select weight unit 4 4 Auto power off setting 5 5 Baud rate setting 6 6 Motion filter speed setting 2 5 1 How to Enter the Functions Required a Turn scale on by pressing ON RE ZERO then press and hold WT before scale completes counting down b The display shows 1 c Press WT until the desired function number appears d Press MODE to enter selection e Press MODE to select setting value f Press WT to confirm setup g Turn scale off and on again to use it as normal 2 5 2 Compulsory Zero Display F 0 A zero weight value will be displayed on the scale i is within the below range Symbol Zero Value Display Range 2Ero 0 0 5e 2 1 1 0e 2Ero_2 1 5e 2Ero_3 2 0e 2 4 2 5e 2 5 3 Offset Value Reading 1 1 Remove all loads from platter the load detected 2 Enter
21. DIGITAL FILTERING ON THE PART IS THE SINC FILTER THE OUTPUT UPDATE RATE AND BANDWIDTH OF THIS FILTER CAN BE PROGRAMMED IN SKIP MODE THE SINC FILTER IS THE ONLY FILTERING PERFORMED ON THE PART SEE PAGE 26 SKIP MODE IN SKIP MODE 15 NO SECOND STAGE OF FILTERING ON THE PART THE SINC FILTER IS THE ONLY FILTERING PERFORMED ON THE PART SEE PAGE 29 22 TAP FIR FILTER IN NORMAL OPERATING MODE THE SECOND STAGE OF THE DIGITAL FILTERING ON THE PART IS A FIXED 22 TAP FIR FILTER IN SKIP MODE THIS FIR FILTER IS BYPASSED WHEN FASTSTEP MODE IS ENABLED AND STEP INPUT IS DETECTED THE SECOND STAGE FILTERING IS PERFORMED BY THE FILTER UNTIL THE OUTPUT OF THIS FILTER BE DISABLED IF DESIRED HAS FULLY SETTLED SEE PAGE 26 SEE PAGE 27 PGA ANALOG CHOP BUFFER SIGMA DELTA SINC FILTER CHOP 22TAP oo OUTPUT DIGITAL INPUT FIR FILTER SCALING OUTPUT FASTSTEP ASISTE OUTPUT SCALING BUFFER PGA SIGMA DELTA MODULATOR OUTPUT CHOPPING THE OUTPUT WORD FROM THE DIGITAL THE INPUT SIGNAL IS BUFFERED ON CHIP BEFORE BEING APPLIED TO THE SAMPLING CAPACITOR OF THE SIGMA DELTA MODUL ATOR THIS ISOLATES THE SAMPLING CAPACITOR CHARGING CURRENTS FROM THE ANALOG INPUT FINS THE PROGRAMMABLE GAIN CAPABILITY OF THE PART IS INCORPORATED AROUND THE SIGMA DELTA MODULATOR THE MODULATOR PROVIDES A HIGH FREQUENCY 1 BIT DATA STREAM
22. F 1 through procedures as described in 2 3 The offset value is displayed on the scale 2 5 4 Full Display Segment F 2 Enter F 2 Press MODE All display segments will be lighted up WN Press WT to quit 5 5 Select Weight Unit F 3 1 Enter F 3 2 Check digits and arrow indications to verify any de 5 1 fects errors Press MODE to select the weighing unit according to the mode indicator Press PCS WT to turn on or off the selected units 4 To set power on initial unit press SAMPLE when at the selected unit 5 Press WT to confirm setup 2 5 6 Auto Power Off Setting 4 This unit is equipped with AUTO POWER OFF function Default setting auto after 30 minutes unused Follow the below steps to disable employ the AUTO POWER OFF function 1 Refer to the 2 5 1 on how to enter 4 2 Press MODE to shift between 0_OFF and 30_OFF To disable the AUTO POWER OFF function select 0_OFF To employ the AUTO POWER OFF function select 30_OFF 3 Press WT to confirm and return to other function selection manual 2 5 7 Select RS 232 Baud Rate 5 This unit equipped with 3 baud rates with default setting at 9600 and N 8 1 Follow the below steps to select the desir 1 Enter F 5 speed 2 Press MODE to select among br 48 br 96
23. MAINTENANCE MANUAL JW SERIES CONTENTS 1 INTRODUCTION SPECIFICATIONS 2 1 SYSTEM BLOCK DIAGRAM PHYSICAL LAYOUT OF ELECTRICAL CONNECTION GENERAL SPECIFICATIONS OPTIONAL INTERFACE I RNAL SETTINGS AND CALIBRATION METHODS 2 23 4 5 N N N N z 5 TROUBLE SHOOTING 3 1 TROUBLE SHOOTING LOOP 3 2 PARTS AND COMPONENTS TROUBLE SHOOTING ELECTRICAL CIRCUITRY 4 1 SCHEMATICS 4 2 PCB LAYOUT BILL OF MATERIAL APPENDIX EXPLOSION DIAGRAM NOVEMBER 2004 Specifications and Function Subject to Change without Notice 1 INTRODUCTION This maintenance manual contains of certain information that may result in fraudulent use Do not release any part of this manual to any end except tho users or un authorized persons Ender users should be advised not to undertake any trouble shooting se listed on the operation manual The internal MINI JUMPER should be so set to prevent un authorized settings r alternations Should a load cell has been replaced make sure that the protection devices are properly set After servicing it is necessary to go through all tests and procedures to ensure the scale meets all the metrological and approval requirements Here are some features of the JW series Zero i
24. TO THE DIGITAL FILTER THE OUTPUT OF THE FIRST STAGE OF FILTERING ON THE PART CAN BE CHOPPED IN CHOPFING MODE REGARDLESS OF WHETHER AC EXCITATION IS ENABLED OR DISABLED THE OUTPUT CHOPPING IS PERFORMED THE CHOPPING CAN FASTSTEP FILTER FILTER IS SCALED BY THE CALIBRATION COEFFICIENTS BEFORE BEING PROVIDED AS THE CONVERSION RESULT SEE PAGE 29 BE DISABLED IF DESIRED SEE PAGE 26 SEE PAGE 24 WHEN FASTSTEP MODE IS ENABLED AND A STEP CHANGE ON THE INPUT HAS BEEN DETECTED THE SECOND STAGE FILTERING IS PERFORMED BY THE FASTSTEP FILTER UNTIL THE FIR FILTER HAS FULLY SETTLED SEE PAGE 26 SEE 29 Figure 3 Signal Processing Chain PIN CONFIGURATION 1 DGND MCLK IN 2 DVpp MCLK OUT 3 DIN PoL 4 DOUT AD7730 T RESET 6 ts TOP VIEW Velas 7 Not to Scale 18 STANDBY 8 ACX AVpp 9 ACX 10 REF IN AIN1 11 REF IN AIN2 yD1 12 AIN2 DO PIN FUNCTION DESCRIPTIONS Function Serial Clock Schmitt Triggered Logic Input An external serial clock is applied to this input to transfer serial data to or from the AD7730 This serial clock can be a continuous clock with all data transmitted in a con tinuous train of pulses Alternatively it can be a noncontinuous clock with the information being transmitted to or from the AD7730 in smaller batches of data M
25. aster Clock signal for the device This can be provided in the form of a crystal resonator or external clock A crystal resonator can be tied across the MCLK IN and MCLK OUT pins Alternatively the MCLK IN pin can be driven with a CMOS compatible clock and MCLK OUT left unconnected The AD7730 is specified with a clock input frequency of 4 9152 MHz while the AD7730L is specified with a clock input frequency of 2 4576 MHz MCLK IN REV A 38 Philips Semiconductors Universal LCD driver for low multiplex rates 1 FEATURES Single chip LCD contraller driver Selectable backplane drive configuration static or 2 3 4 backplane multiplexing Selectable display bias configuration static 19 or 14 Internal LCD bias generation with voltage follower buffers 40 segment drives up to twenty 8 segment numeric characters up to ten 15 segment alphanumeric characters or any graphics of up to 160 elements 40 x 4 bit RAM for display data storage Auto incremented display data loading across device subaddress boundaries Display memory bank switching in static and duplex drive modes Versatile blinking modes LCD and logic supplies may be separated Wide power supply range from 2 V for low threshold LCDs and up to 9 V for quest host LCDs and high threshold automobile twisted nematic LCDs Low power consumption Power saving mode for extremely low power consumption in battery operated and telephone appl
26. e LOGIC OUTPUTS Including MCLK OUT Vor Output Low Voltage Vor Output Low Voltage 0 4 Output High Voltage 1 0 Von Output High Voltage Vpp 0 6 V loating State Leakage Current 10 loating State Output Capacitance 6 TRANSDUCER BURNOUT AINI Current AINI Current nitial Tolerance 25 C drift FFSET TARE DAC Resolution SB Size Drift Drift vs Time 16 differential Linearity SYSTEM CALIBRATION ositive Full Scale Calibration Limit C 3 2 6 2 5 25 0 25 0 75 1 05 x FS 1 05 x FS 1 05 x FS 0 8 x FS 2 1 XFS egative Full Scale Calibration Limit Offset Calibration Limit nput Span POWER REQUIREMENTS ower Supply Voltages AVpp AGND Voltage DVpp Voltage ower Supply Currents AVpp Current Normal Mode AVpp Current Normal Mode DV pp Current Normal Mode DVpp Current Normal Mode AVpp DVpp Current Standby Mode Power Dissipation Normal Mode 4 75 to 5 25 5 25 1 2 7 to 5 2 10 3 22 4 Standby Mode REV A max max max min min to V max min to V max to V max min to V max min to Y max min to V max max max min min max max min min max pF typ nA nom nA nom typ typ Bit mV min mV max ppm C max ppm 1000 Hours typ LSB max max max max min max min to V max to V max mA max mA max mA max
27. er into a digital signal Subsequently the resulting count is processed and managed by the CPU the output data to display driver which formats the The CPUreferstothe instructions fromthe keyboard on the display panels 2 2 PHYSICAL LAYOUT OF ELECTRICAL CONNECTION C RS 232 D SUB 9 DC JACK LOAD CELL _ N RECHARGEABLE BATTERY 6V 3Ah MAIN BOARD 2 3 GENERAL SPECIFICATIONS 2 3 1 Overall View 2 3 2 Overall Dimension 220 W X 224 D X 70 H mm Max 2 3 3 Technical Specifications Model No Capacity Division Max e 1 50000 JW 250 2509 0 0059 270 500 5009 0 019 270 1000 10009 0 029 270 2500 25009 0 059 1 30000 24 300 300g 0 01g JW 600 600g 0 02g JW 1500 1500g 0 05g JW 3000 30009 0 19 Tare Range Full Tare Range Power on Full Power on Zero Range Zero Range Zero Range 2 Min Load 20e Weighing Gram ounce pound troy ounce Units grain penny weight metric NOTE A carat momme troy tael tola dram Power By Built in Rechargeable Battery Source or AD DC Power Adaptor Operating 0 40 C 32 104 F Environment yon condensed R H 85 Weight N W 2 0kg G W 3 0kg NOTE A To comply with the law of certain countries the some of the weighing
28. hecking 3 2 3 1 Check that it is soldered and connected properly between LCD and driver IC PCF8576 driver IC PCF8576 and CPU 3 2 3 2 Check whether LCD is broken 16 3 2 4 CPU Checking 3 2 4 1 Check that all pins are seated properly into the socket 3 2 4 2 Check that the Crystal Oscillator works 3 2 4 3 Check the RESET is normally low 3 2 5 A D Unit Checking 3 2 5 1 Check that the 5V powers are correctly fed to the A D unit 3 2 5 2 Check that the signal output of loadcell is normal 3 2 5 3 Check OP Amplifiers amp A D Converter AD7730 when no error is found with the above checking procedures the trouble can be caused on the load cell or the PCB itself Replace a new on could be better to identify the defectiv Inthis way the readout of weight would varied because of the output voltage of load cell and different span value so re calibration is required after this replacement 17 3 2 6 ERROR CODES AND DESCRIPTIONS ERROR CODE DESCRIPTION 000000 Excess weight over full capacity Err_ov Span value too high during calibration 000000 Negative weight over weighable range 18 4 ELECTRICAL CIRCUITRY 4 1 SCHEMATICS 19
29. ications 12C bus interface TTL CMOS compatible Compatible with any 4 bit 8 bit or 16 bit microprocessors microcontrollers 3 ORDERING INFORMATION TYPE NUMBER Product specification PCF8576 May be cascaded for large LCD applications up to 2560 segments possible Cascadable with 24 segment LCD driver PCF8566 Optimized pinning for plane wiring in both single and multiple PCF8576 applications Space saving 56 lead plastic very small outline package VSO56 Very low external component count at most one resistor even in multiple device applications Compatible with chip on glass technology Manufactured in silicon gate CMOS process 2 GENERAL DESCRIPTION The PCF8576 is a peripheral device which interfaces to almost any Liquid Crystal Display LCD with low multiplex rates It generates the drive signals for any static or multiplexed LCD containing up to four backplanes and up to 40 segments and can easily be cascaded forlarger LCD applications The PCF8576 is compatible with most microprocessors microcontrollers and communicates via a two line bidirectional 12C bus Communication overheads are minimized by a display RAM with auto incremented addressing by hardware subaddressing and by display memory switching static and duplex drive modes PACKAGE DESCRIPTION VERSION PCF8576T plastic very small outline package 56 leads SOT 190 1 PCFS576U I chip in tray EE PCF8576U 2 chip with
30. ndicator Tare indicator Negative value indicator Subtractive tare function Power on zero function Manual zero function Power saving function 014 1730000 Metric Power 5 2 types Equippe Bubble 6 x 19mm digits bold type LCD display Low battery warning signal Counting amp percentage functions included or 1 50000 display resolution unit 12 user programmable weight units ource by 6V 3Ah rechargeable battery or AC adaptor of calibration d with RS232 interface amp backlight facility level included Wind shield included JW 250 300 500 600 1000 2 SPECIFICATION 2 1 SYSTEM BLOCK DIAGRAM nue p Description then conveys data into readout LCD DISPLAY DRIVER NT ERFAC E POWER SUPPLY KEYBOARD 1 ADAPTO 6 KEYS 500mA 2 RECHARGEABLE BATTERY 6V 4Ah When an article is placed on the platter the load of the article is applied to the load cell inside the scale he resistance to the excitation current in the strain gauge will then hanged and the analog output signal varies It is amplified and digitized continuously by the A D convert
31. nel Bit operation instruction Page free jumps 8 bit unsigned division 8 bit unsigned multiply BCD arithmetic operations Direct addressing Indirect addressing Nested interrupts Two priority level interrupts A serial port Power save modes Idle mode and power down mode Code protection function One watch dog timer WDT Low EMI inhibit ALE Taiwan 4F No 1 Creation Road 1 Science based Industrial Park Hsinchu Taiwan 30077 TEL 886 3 579 2926 886 3 579 2988 FAX 886 3 579 2960 886 3 578 0493 Specifications subject to change without notice contact your sales representatives for the most recent information 1 19 Ver 1 1 PID 8958 05 01 32 SyneMOS Technologies Inc May 2001 Pin Configurations z 88 8588 8588 ES 4444 XE lt lt lt AA 6 EL VOODOO OO OO 6 54321 4 40 40 38 29 7 P0 4 AD4 15 PO 4 AD4 pie gt HR P16 PO 5 ADS P17 9 af ROSADO P17 PO 6 ADS 2 res SM8958 RES SM8958ihhQ PO 7 AD7 nxpiP3 0 E RXD P3 0 12 441 PLCC P43 44L QFP PA 1 Q 13 ALE TXDIP3 1 ALE INTO P3 2 14 Top View PSEN HINTO P3 2 Top View PSEN INT1 P3 3 15 311 P2 7 A15 HINT1 P3 3 2 7 15 T0 P3 4 15 f P2 6 A14 TO P3 4 2 6
32. v K1 Zap ayi 0 VIN K2 4 4 1Y2 ON 00 ON K3 gt 13 gt EOBAT LOBAT S 172 AUTO OFF AUTO OFF GND K5 gt 4 2 1 271 zu gt 15 2A2 272 K7 771243 2Y3 o 7 7 M4 274 CON 6P WF 5 gt Rx rs 2000 i DIR DSR E TX 93 LIT TUUS E239 Ki 2 22 GC 4 ka 2 ECS ECS 5 1 A 1uF ur 18V KC 5 le 4 a3 i Title 1 C42 C4 C40 9 38 237 C36 C35 2 mM g lt TXD R14 RX gt gt RXD 100P 100P DSR lt DIR gt 44 4 pep CH 15 1 45V D N Revisi 1 47K ES t o 16770232 c54 rawing No evision ES EC7 AT ECB 1042 JW 10 5 Size Sheet 1 of 5 Date 91 07 11 Drawn by 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1061 9 94 A 5V 1000uF 16V a2 LO 50 21 A Y 3 Shia WH c47 END 10uF 16V 1042 2 1047 470U 18V jen T 100uF D2 15 1N4148 CON 2P PW 4 4 1 7 a I AUTO 0FF N 220R 26 gen E z 2 o CON 2P PW 10uF 18V EK x KC 201 LEDI TO BATTERY jeu 8 2V v v ay x
33. vices Inc REV A Information furnished by Analog Devices is believed to be accurate and reliable However no responsibility is assumed by Analog Devices for its use nor for any intringements of patents or other rights of third parties which may result from its use No license is granted by implication or otherwise under any patent or patent rights of Analog Devices One Technology Way P O Box 9106 Norwood MA 02062 9106 U S A Tel 781 329 4700 World Wide Web Site http www analog com Fax 781 326 8703 Analog Devices Inc 1998 35 AD7730 SPECIFICATIONS Parameter STATIC PERFORMANCE CHP 1 No Missing Codes Output Noise and Update Rates Integral Nonlinearity Offset Error Offset Drift vs Temperature Offset Drift vs Time Positive Full Scale Error 5 Positive Full Scale Drift vs Temp 6 7 Positive Full Scale Drift vs Time Gain Error 8 Gain Drift vs Temperature 6 Gain Drift vs Time Bipolar Negative Full Scale Error Negative Full Scale Drift vs Temp Power Supply Rejection Common Mode Rejection CMR Analog Input DC Bias Current Analog Input DC Bias Current Drift Analog Input DC Offset Current Analog Input DC Offset Current Drift STATIC PERFORMANCE CHP 0 No Missing Codes Output Noise and Update Rates Integral Nonlinearity Offset Error Offset Drift vs Temperature Offset Drift vs Time Positive Full Scale Error Positive Full Scale Drift vs 7 Positive Full Scale Drift
34. x 945 lt OFF 45V 05 RED 184148 46 R24 zero gt gt 1047 22K R25 R27 M150K 22K 06 4 A733 470R gt LOBAT R26 R28 1 M500K 27K Title Drawing No Revision Size A3 Sheet 3 OF 3 Date 91 07 11 Drawn by 1 2 3 5 6 yi 8 9 21 SVA 017 5VA 5VA 11 A A ge AD7730 gs DSS306 471 RI 1034 100V MEF OP2177 ca R6 1 3 2 1 s 1 3 51 103J 100V MEF 102 5VA gt i 1 ANM Tour 1BV T 8 24 1 T M4K7 2 1 AGND 10uF 16V RB L 2 ane R3 100R 1009 22 STANDBY 018 O 5va E M10K DIN cs DEE DOUT 529 219 _ 06 T45vA 1042 en p17 SCLK RESET Ra pun VBIAS L E Mame ca N3K BE PRA ACXC 22u AIN2 DO C 0 22U 10 5MM 1034 100 M REY 620 R11 INTO 2 gt te s MCLKIN EMIZ R2 14 100 REFIN DSS306 471 ED vr 15 Rer n MCLKOUT 5 1 4 194 MHz s gt 5 y 3 T R7 MIDOR m m REF DD 47P 47P T UB 0 2177 2 TC3 29 v
35. y The charging voltage is regulated by Q1 C1061 and 201 8 2V for about 7 volts 15 Thechargingcurrentwillgodownautomaticallywhenvoltagereached 02 C945 and 18 1 2R 1 2W provide Over Current protection 3 5V power drives digital circuit system 011 1722 5 0 is 5volts Voltage Regulator 4 5V power drives analog circuit system U5 NS2950A is a 5volts Voltage Regulator 5 Auto o If the scale is set with 30 oFF or even under LO BAT situation after fixed time interval CPU will release a low potential signal to draw down Q3 then Q4 cuts off the scale will be shut down immediately 6 Low Power Detection The Q6 A733 is designed to detect the power level When battery powerislessthan5 5V thecollectorpolewillbecomehighpotential then CPU will instruct LCD display to show LO BAT symbol 3 2 1 2 Input voltage 5 5V or higher Check and recharge battery if voltage is less than 5 5 3 2 1 3 System voltage 5V 10 Check that the system voltage is within 5V 10 a less than 4 5V the CPU may not work properly b more than 6V ghost will appear on LCD 3 2 2 Platform Stopper Checking The platform device shall not touch anything around itself during operation Check that the platform is not contacted with the upper no load and or lower with load stopper 3 2 3 LCD Display C
36. y MCU SM8958C25 25 MHz 32KB internal memory MCU SM8958C40 40 MHz 32KB internal memory MCU Description The SM8958 series product is an 8 bit single chip micro controller with 32KB flash amp 1KB RAM embedded It is a derivative of the 8052 micro controller family With its hardware features and powerful instruction set it s straight forward to make it a versatile and cost effective controller for those applications which demand up to 32 O pins for PDIP package or up to 36 I O pins for PLCC QFP package or applications which need up to 32KB memory either for program or for data or mixed To program the on chip flash memory a commercial writer is available to do it in parallel programming method Ordering Information yywwv SM8958ihhk yy year ww week v version identifier A B process identifier L 3 0V 3 6V C 4 5V 5 5V hh working clock in MHz 25 40 k package type postfix as below table Pin Pad Configuration OL POP pagers HALPLOC 1 rar 5 8958 8 Bit Micro controller with 32KB flash amp 1KB RAM embedded Features Working voltage 3 0V 3 6V For L Version 4 5V 5 5V For C Version General 8052 family compatible 12 clocks per machine cycle 32 KB internal flash memory 1024 bytes data RAM 3 16 bit timers counters Four 8 bit ports for PDIP package Four 8 bit ports one 4 bit I O ports for PLCC or OFP package Full duplex serial chan
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